Where does “О́стрів Змії́ний” come from?

О́стрів Змії́ний (Ukrainian) comes from Romanian Insula Șerpilor, from Russian змеиный, from Russian змея́, from Proto-Slavic zmьja, from Proto-Indo-European dʰéǵʰōm, from Proto-Indo-European -ōm, from Proto-Indo-European -mi.

Ancestry of “О́стрів Змії́ний”, step by step

Step	Language	Word	Meaning
1	Romanian	Insula Șerpilor	—
2	Russian	змеиный	snake; serpentine; serpentine, venomous, viperine
3	Russian	змея́	snake, serpent
4	Proto-Slavic	zmьja	snake
5	Proto-Indo-European	dʰéǵʰōm	earth
6	Proto-Indo-European	-ōm	emphatic suffix or postpositive particle
7	Proto-Indo-European	-mi	—

Every word from Proto-Indo-European -mi →Every word from Proto-Indo-European -ōm →Every word from Proto-Indo-European dʰéǵʰōm →